Motor control



Sept. 4, 1934. D. s. HULFlSH MOTOR CONTROL Filed Feb. 27. 1952 INVENTOR DAV/D 5. HULF/SH ATTORN Patented Sept. 4, 1934 burr 1,972,266 MoToR CONTROL David S. Hulfish, Chicago, 111., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application February 27, 1932; Serial No. 595,503

- 11 Claims. (01. 17841.1)

reclosing of the line current or the interruption of the line current may continue for any interval oftime;

A clear understanding of the invention may be hadfrom the following description, taken in conjunction with ,the accompanying drawing, where- Fig. 1 shows the printing elements of a well known type of printer or telegraph typewriter with the embodiment of the present invention.

Fig; 2 shows a circuit which embodies the invention in a motor control system of .two stations with added stations indicated. I

Fig. 3 shows an alternative circuit arrangement. i 70 The practice of selection in printing telegraphy is to divide the total number of characterswhich it is desire'dto print selectively into two groups of which one group contains the letters and characters more frequently used, and the other group the control of motors at all stations. contains the figures andcharacters less frequenty A further object is to provide a system wherein used. The selection of a character then comthe control of the motors may be effected pri- -prises two successive selections, first the selecmarily by the apparatus normally providedfor tion of the group, called case, and then these- 25 the transmission of intelligence, whereby the aplection of, thezcharacter in that case. The selecparatus necessaryfor purposes. of motor control tion ofthe case ,is recordedby l ck the mechiS p a min mumanism of the receiving printer in such manner A further object of this'invention is to provide that all subsequent selections will be printed in a telegraph system so arranged that it may be that case until control is received to change to 30 left unattended by removing all power or Sigthe alternative case. Letter case carries selecnalling current fromthe system without production among at least 26 characters, while figure ing a y adv se O undesired eflectupon the mocase does not demand so many and, therefore, tor control system or upon the motors controlled offers spare selections which are not demanded yby figures and special symbols. This invention The objects of the present invention are attakes advantage of the condition offering the tained by prvid electrical It tS and el ys, spare: selections and uses one of these selections the contacts being operated by the normal telein the figure case as a selective medium to congraphic transmission apparatus to control the retrol the starting and stopping of the driving molays which in turn control the starting and stoptor of the telegraph instrument. Thus, by a 40 ping of the driving motors. The contacts are selective code establishing the, figure case fol- 95 operated in predetermined order by the translowed bya selective code which is idle for printing mission of determined intelligence signals which purposes,- in that it is not required to print any are not recorded on the printing telegrapha'erecord, a selective medium is obtained which is ceiver. This results in stopping themotor with used for controlling the motors. Each of the sethe line closed and with the normal currentof an lections involves a mechanical action in the tele- 1 0 idle line. The interconnection of relays is such graph printer and to convert the mechanical that the current in the line may be discontinued actions into electrical control for the motors, this to produce a change in the condition of the coninvention provides a pair of electrical contacts trolling relays but not to start the motors. Suboperated by the case shiftmechanism and a pair sequently the current inthe line may be reestabof electrical contacts operated by'the typeprint- 5 lished to produce a further change in the condiing mechanism. In the case of the motor control tion of the relays which will start the motors and signal both of these contacts will be operated at This invention relates to systems and apparatus for operating telegraph machines and more particularly to telegraph systems and apparatus for controlling remotely the operation of driving 5 motors of such machines.

The system of the present invention is particularly adapted for-isolated lines which are not associated with switchboards or; equivalent switching equipment. 7 In such isolated lines the 10 control of the motors for starting and stopping cannot be exercised automatically by the connection or disconnection of the line at a switching point and the control, therefore, must be exercised arbitrarily and voluntarily by the. persons operating the system.

The object of this invention, therefore, is to provide a system of motor control devices, auxiliary to the apparatus for the transmission of intelligence, such that an arbitrary action on the part of an operator at one station may result in which will return the control elements to normal idle condition. A stopped motor may be restarted by a momentary interruption followed by the same time because in going into the figure case position the figurecase contactsare operated to continue during the period that thepointer is in that position after which the character selection will operate the character contacts momentarily. The manner of adding these contacts to the telegraph printer varies with the type of printer to which the motor control system is applied. In Fig. 1 the printer shown is of the type disclosed-in the patent-to H.L.:-Krum,No. 1,-'Z9'6, 378, issued March '17, -193l,-and a more detailed explanation of the structure may be had byreference to that patent. For typewheel printers the character contact may be operated by a cam on the typewheel or on its shaft and the .casecontact may be operated by any mechanical part which occupies one position "iornnezcasezandanother position for another case. The 11168118101 operating a character contact in a typewheel printer of the code disc and permutation-type is described in the patent to A. F. Dixon No. 1,201,- 809, issued October 1'7, 1916. In the printerithere shown, the case contacts would be operated by *the armature 220'ofthe-shiftma'gnet 21-4.

In'the further description the *con'tactswill be referred to as shift and M, the shift contact "being the contact which is perated by shifting 'fromletter case to figure 'caseand the -'M"contact being thecontactwhichis operate'dby the operation which prints the letter M in the letter case "but which does not "print in the figure case "position.

Referring nowto' Fig. 1; a cylindrical platen -1 is arranged to'slide-upon a'-fixed s'ha'ft'Zby control "of an extension "3 which is articulated with an operating arm 4 of'a'rockerfi. The-rocker 5'is engaged byamember '6 which, in-turn; may be operated by the selecting mechanism of the printer-in response to thecase shift con'dition or code receivedoverthe line wire. -'A pair o'f-con tacts '7 are fixed to the frame -8 of the printer in such manner that when the platen 1 isintheletter'case position, asshown, the contacts will be -closed'andwhen -t'he-platen-1isin thefigure' shift position shown dotted the contacts '7 will be open because 'the rocking member 5 then will occupy itsalternative-position.

"The printing -mechanism comprises a plurality o'f"type"barsll each havinga letter type 12, some of which have a figure type in the location '13 "but the typebar for the letter is without a printing type in the location 13.

Each :typebar has a pull bar 14 geared -to the "typeba'r and operable by a power smeniber I5,

whenever the pullbar has'been selecte'd inresponse to a :received code which has' setithe "permutation 'bars. Apair of contacts 16 are mounted upon'a'fram'e member =17 in such=manner that they will be engaged and opened by the pull bar 1 1wheneverthe'typebar His-operated.

When-printing the letter 'M the contact l'fi -will bra-opened, but the contact 7will not be open at that time. When printing figures the contact '7 'willbe -'opened, butthecontact 1 6 will not-be opened. In *response to the signals fshi'ft M, the contact 7 will be :opened continuously while "in the shifte'd pos'itionand the contact 1-"6 -will be opened momentarily when the pull bar 'for the letter M -i-s operated resulting imstopping the-mo- 'tor as'will be seen by a study of the circuit con- 'nectionsj Referring to "Fig. 2; the shift contacts -'7 "and the lVL-contacts 16 are labeled a'sin Fig. 1. 'Two stations '29 and are A shown which 1 are identical :except for the main line power supply. At station 30, the grounded battery :31 supplies :power 'through a :main eswitch T32 :and nnain line 3-3 :to ground'-at 34,Ibut should it besdesiredrtosadd ssta- "contac'ts 1'6 momentarily. tar-yopening-of contacts and 16, the line curtions the ground at 34 is replaced by a further line wire 39 which passes through the added stations to ground which completes the return to the battery 31. At each station the telegraphic printing equipment is represented by the selector magnets 35, a sending transmitter contact 36 zanda-m'otor 37. The motor control .devices com- "prise the relays 51, 52 and 53 which operate in ,theorder mentioned and the motor starting key 38. The relay 51 is shunted by its own armature 40 and back contact in series with the parallel contacts '7 and 16. Thus by opening the shift contacts and the M contacts at the same time the :shuntzmay rhezremoveTd from the relay 51. Relay 53 isshuntedlby contact 41 of relay 52, and further, upon=the operation of relays 51 and 52, .the relay .53..is;.shunted alternatively by armature 40 and the armature 42 and front contacts of thezrelays-Eil and 52. The armature 43 and front contact of the relay 52 are connected to shunt "the sending contact "36 while the contact 44 of this relay is connected to start and stop the -motor-M. A locking circuit'for the relay 52 "is provided through armature 45 i and front contact thereof, relay 52 and contacts'of'relay53. The

"motor and the "relay 52 are operated by powerreceived through a switch "50.

In the alternative circuit arrangement "of 8, the switch 3-2 is replaced by locking keys "47 individual to :each station and batteries '31 'are rio5 "providedfiindividual to each station. The keys? includes the-battery 'al in theline'-33-or excludes it -'f1'om the linegas des'ired.

r I The operation- 0mm: system is as follows:

In condition of non-operation of "the system'i im 'relays 51, 52, '53 are non-energized and'switches 3-2 '-and"50 are "open. To put the system in condition for operation, switches "-32 and 50 are morm'ally closed at eac'h station 'which establishes =a =norma'l line current through battery 31, 'main'1n5 switch 32, printer magnets 35, sending contact 3'6,-'contacts-1'1"ofrelay 52, armature io and back "contact *of =re'lay;51, shift 'and M 'contewts '7 and ""16, *starting switch 38, line wire'33 and-similarly 't'hrough station :29 tosground '34. The closing I of EN switches 50 starts -the =mot0rs 3'7 at eachstation and messages may be sent from elther sending contact 36" to 1 both printing magnets '35.

To *stop the motors 'the signals shift rand M are sent which open the -'contacts 7 at both sta-1 5 tions during the period of shiftcondition and the During 'the momenrent from battery 31 flows through relay 5'1 in- 'stead :of through its -shunt,: energizing :relay 51 which remains -'opreraztted 'by icurrerit from hattery 31, through *transniltter contact 86 relay contacts ll and 'winding of relay "51 'to line '83. Armaturwm of'a'elay Sl-o'loses-an obvious circuit lfor "energizing relay "52, which by opening =contac'ts 44 stops the motor 37. "Armature 43 of relay 52' s'hunts the transmitter contact "36 so that *any accidental operation of thc transmitter will not distui blthe system. Armature 4541f relay.'52 closes a holding circuit 'for relay 5-2 which ,1 may 'be traced from switch 50 through win'ding rof relay "52, 'armature'AB, contact of relay 53, returning to the other side of switch '50, which will retain relay 52 =energized after deenergiza- 'tion "of :relay '51 as zdescrlbed'llater. TRelay 53 i -heretofore-has been shunted by contact 41 and relay '52 now forms a second shunt by =armaiture =42 in :series with front contact and :armashunt of relay 53. By this operation theshunt of relay 53 has been changed Without operating the relay 53.

Both of the stations 29 and 30 have performed the operations described. The system will remain in the condition now attained with all motors stopped until a, manual operation is performed at any connected station to start all of the motors.

To start the motors the key 38 is operated momentarily. The opening of the key 38 stops the flow of current from battery 31 and deenergizes relay 51 which forms again its shunt through armature 40 and its back contact and contact 16 and relay 51 thereafter cannot be reenergized While contact 7 or 16 is closed. The opening of the armature 40 from its front contact opens the shunt of relay 53 which, however, is not energized because of the absence of line current at this time due to the open key 38. The relay 52 remains energized through its holding circuit as described. Upon the reclosing of the key 38, current from battery 31 flows through-armature 43 of relay 52 and winding of relay 53 thence through contacts 40, 16 and .38 to the line. Relay 53 is energized which releases relay 52 by opening its holding circuit and the release of relay 52 places the entire system in its normal operating position, since contacts 44 start the motor 37, contacts 41 shunt the relay 53 and armature 43 removes the shunt from the transmitter contact 36.

When the motors have been stopped by the shift and M signals as described and it is desired to discontinue transmission for. the night or for any determined interval, the switch 32 may be opened, eiIecting exactly the same conditions described for the opening of switch 38. The motor 37 will not be started but should the power switches 50 be opened at the several stations, the relays 52 will be released to close their contacts 44 and then the motors 37 will be restarted when the switches 50 are reclosed and may be stopped by closing the line circuit at switch 32 and sending the signals shift and M which will place the entire system in operating condition with motors stopped.

In Fig. 2 the battery 31 and main switch 32 are supplied at but one station and the cooperation of that station to close switch 32 is required to enable any two stations on the line to operate the telegraphic equipment. In the alternative circuit arrangement shown in Fig. 3 a separate battery 31 and its key is provided for each station, the key 32 taking the form shown at 47 in Fig. 3. The key 4'7 is a locking key and its operation at any station will include a battery 31 to enable all stations to operate. Such a system may be operated in the following manner:

The system normally is idle, without line current, with all relays 51 shunted and not energized, with all relays 53 unenergized and included in the line circuit, and with all relays 52 energized by current in their individual holding circuits through the armatures and back contacts of their respective relays 53. A station desiring to send a message will insert its battery 31 into the line circuit by reversing its locking key 47 and thus will initiate a period of activity in the line. The battery now included in the line will energize all relays 53, which will open the holding circuits of all relays 52, thus deenergizing all relays 52. Contacts 44 will start all motors 37, armatures 43 will open the shunts of all sending contacts 36, and contacts 41 will shunt all of the relays 53 to remove them from the line circuit. The initiating station then may send messages,

. then send-shift and M signals to stop all motors,

then remove the battery from the line by restoring the key 47. Removing the battery 31 from the line will deenergize all relays 51, restoring the line to its idle condition, without line current, as described above.

Although the invention has been described in connection with a specific form thereof, it will be understood that it has further applications and it is not intended to be limited by the embodiment shown for illustration.

The invention claimed is:

1. In a motor control system, a printer, a motor for driving said printer, a pair of electrical contacts in said printer and operated by the shift mechanism of said printer, a pair of elec- .trical contacts in said printer and operated by a character mechanism of said printer, and means to stop said motor controlled by said shift contacts and said character contacts jointly.

2. In a motor control system, a printer, a motor for drivingv said printer, a pair of electrical contacts in said printer and operated by the shift mechanism of said printer, a pair of electrical contacts in said printer and operated by a character mechanism of said printer, and a motor stop relay responsive to the concurrent operation of said contacts.

3. In a motor control system, a printer, 2. motor for driving said printer, an electrical contact in said printer and operated by the shift mechanism of said printer, an electrical contact in said printer and operated by a character mechanism of said printer, a signalling line, and a motorfor operating said first contacts, and further.

means for operating said further contacts.

5. In a motor control system, a plurality of stations, motor starting relays at each station, a closed line circuit including all of said motor starting relays, sources of current individual to";

each of said stations, means at each station for including in said line circuit a source of current for operating said relays, and further means whereby the operation of said relays removes said relays from said circuit.

6. In a motor control system, a plurality of stations, motor starting relays at each station, a closed line circuit including all of said motor starting relays, sources of current individual to each of said stations, means at each station for including in said line circuit a source of current for operating said relays, further relays for stopping said motors, and further means whereby said starting relays may be included in the line circuit for operation by said source of current.

'7. In a motor control system, a plurality of H stations, motors at each station, motor stopping relays at each station, a closed line circuit, and

code responsive signal mechanism for including said relays in the line circuit to be operated by ,1

the line :current whereby :said relays operate Z130 stop-saictmotors. r q

'8. In a telegraph :system, telegraph-sets, ;m0- 'torszior ldriving isaiditelegraph sets, .azline circuit, motor-stopping :relays, nrotor starting rel'ays, means responsive tolline.signalsiforlincluding said .niotor. stoppingrelaysiin'said line' circuit forsoperation by rlinecuifrent, :means forlremoving isaid line current from said line to release :said relays, andimeans operated'by saidrmotor stopping .relays uponreleaseithereofzwhereby .saidimotor stopping relays areremoved-tfrom said line circuit and said motor starting relayslare substituted.

9. In a telegraph system, Ytelegraph stations, motors at said stationsgmotor-stopping relays at said stations, motor .-,starting relays .at said stations, i a .line l-circuit, imeans responsive to 'line signals for including said motor stopping =relays 'in said line circuit for operation by line current, means at all stations for :removing said motor stopping=relays from -said line-circuit and substituting said motor-starting relays.

10. In a telegraph system, aplurality of =telegi'aph stations, operating motors at said sta- -tions,-an operating signaling .line circuit including telegraphicsignalingapparatus at said stations and including a line battery ataone of said stations, motor-stopping relays vat said stations,

and means controlled by-said'telegraphic signaling apparatus for including said relays in said signaling line circuit :for operation by "said line battery to stop said motors.

11. In a remote control system, -a telegraph transmitter, a telegraph receiver, a line .circuit connecting said transmitter and said receiver,.a motor for said receiveiyaa power circuit for said motor, a :motor-control :relay normally excluded from said .line circuit during :periods of :telegraphic ecomniunication means controlled by ,sumptioniof current insaidlineand also excluded from said line.circuitzduringperiods of telegraphic communication.

DAVID S. HULFISH.

EIDO 

